Varian 990 dCLD II, Operation Manual

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Model 990 dCLD II Component Leak Detector
3-5
3.1.4.2 Discrete I/O Connection
To use the Discrete I/O J3 for operations, build the cable for PLC connection according to
Table B-1 on page B-1 in Appendix B “Customer Accessible Inputs and Outputs”. Remem-
ber, the 990 dCLD II does not provide power to this I/O.
Setup of the parameters must be accomplished in one of three ways:
❑
Using a host computer via host serial port J6
❑
The combination of PLC and host computer (see Appendix A “Communications
Protocol” and Table B-3 on page B-9
❑
Via the optional front control panel
Control is then turned over to the PLC for operation.
3.1.4.3 Host Computer Connection
To use a computer for operations, build the cable according to Table B-3 on page B-9 and
connect to the host serial port J6. For greater security, you must also make connection to J3,
pin 6 to make PARALLEL ENABLE available. Asserting PARALLEL ENABLE prevents operat-
ing parameters from being changed while it is active. See Appendix A “Communications
Protocol” for detailed information regarding the commands used to set up, monitor and
operate the 990 dCLD II. A cross reference of the different modes of operation is provided in
Table 2-11 on page 2-15.
3.1.4.4 BCD Output Connection
To use BCD J4 for output, build the cable for PLC connection according to Table B-2 on
page B-4. Remember, the 990 dCLD II does not provide power to this I/O.